Voltage abnormity tracing method, system and equipment based on station line transformer user topological relation and medium

Abstract

The invention belongs to the technical field of power system fault diagnosis, and discloses a voltage anomaly tracing method, system and equipment based on a station line transformer user topological relation and a medium, so as to solve the problem that the positioning of a voltage anomaly root is not accurate or rapid. The method comprises the following steps: acquiring station line transformer user information of a target power system to construct a station line transformer user topological relation model; acquiring key node real-time data of the target power system, wherein the key node real-time data comprises a user voltage real-time value; obtaining a preset voltage abnormity judgment standard, judging whether the user voltage real-time value is abnormal or not based on the preset voltage abnormity judgment standard, and marking a corresponding voltage out-of-limit type; and counting the number of abnormal users in a preset abnormity evaluation unit, if the number of the abnormal users is not smaller than a preset slice out-of-limit threshold value, recording as slice out-of-limit voltage abnormity, and gradually tracing upwards from a user side based on a connection relation in the station line transformer user topological relation model so as to determine a source of voltage abnormity.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system fault diagnosis, and specifically relates to a voltage anomaly tracing method, system, equipment and medium based on a station-line-substation topology relationship. Background Art

[0002] With the widespread application of power electronic devices and distributed energy, problems such as voltage over-limit and fluctuation are becoming increasingly prominent. Voltage anomalies not only threaten the normal operation of power equipment and shorten its service life, but may also cause frequent failures of electrical equipment at the user end, and even cause safety accidents. At present, the troubleshooting of voltage anomalies mainly relies on voltage management personnel. Voltage management personnel need to cross different systems and professional fields, fully intervene from power generation, transmission to distribution systems, and work closely with multi-professional teams such as electrical and operation and maintenance to conduct in-depth analysis of various types of voltage anomalies one by one, striving to solve the fundamental problems. However, traditional manual troubleshooting methods are inefficient and prone to omissions and misjudgments; at the same time, cross-regional and cross-system collaborative analysis faces challenges, because the monitoring data formats and communication protocols of different regions and systems are significantly different, data fusion is difficult, and it is difficult to implement comprehensive voltage anomaly analysis. In addition, the analysis method based on local data lacks comprehensive consideration of the complete topological relationship of the power network, resulting in inaccurate and inaccurate positioning of the root cause of voltage anomalies. Summary of the invention

[0003] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a voltage anomaly tracing method, system, equipment and medium based on the station-line-substation topology relationship that meets one or more of the above-mentioned needs, aiming to improve the accuracy and efficiency of voltage anomaly tracing.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] In the first aspect, the present invention provides a voltage anomaly tracing method based on a station-line-substation topological relationship, comprising the steps of: S1, obtaining the station-line-substation information of the target power system to construct a station-line-substation topological relationship model, wherein the constructed station-line-substation topological relationship model includes the connection relationship between the substation and the transmission line, the connection relationship between the transmission line and the transformer, and the connection relationship between the transformer and the user; S2, collecting real-time data of key nodes of the target power system, wherein the real-time data of the key nodes includes the real-time value of the user voltage; S3, obtaining a preset voltage anomaly judgment standard and based on this, judging whether the real-time value of the user voltage is abnormal and marking the corresponding voltage over-limit type; S4, counting the number of abnormal users in a preset abnormal evaluation unit, if the number of abnormal users is not less than a preset sheet-like over-limit threshold, it is recorded as a sheet-like over-limit voltage anomaly, and based on the connection relationship in the station-line-substation topological relationship model, tracing upward from the user end step by step to determine the source of the voltage anomaly.

[0006] As a preferred solution, the station-line-user information of the target power system includes substation information, transmission line information, transformer information, and user information; the substation information includes the location, number, and capacity of the substation; the transmission line information includes the length, model, and direction of the transmission line; the transformer information includes the installation location, capacity, and transformation ratio of the transformer; and the user information includes the user's address and load.

[0007] As a preferred scheme, the preset voltage abnormality judgment standard includes a normal operating range and an operating deviation range corresponding to the voltage level; based on the preset voltage abnormality judgment standard, it is determined whether the user voltage real-time value is abnormal and the corresponding voltage over-limit type is marked: if the user voltage real-time value is lower than the lower limit value of the normal voltage range and not lower than the lower limit value of the operating deviation range, it is marked as a general over-limit; if the user voltage real-time value is lower than the lower limit value of the operating deviation range, it is marked as a serious over-limit; if the user voltage real-time value is higher than the upper limit value of the normal voltage range and not higher than the upper limit value of the operating deviation range, it is marked as a general over-limit; if the user voltage real-time value is higher than the upper limit value of the normal voltage range and not higher than the upper limit value of the operating deviation range, it is marked as a general over-limit; if the user voltage real-time value is higher than the upper limit value of the operating deviation range, it is marked as a serious over-limit.

[0008] As a preferred scheme, the normal operation range and the operation deviation range corresponding to the voltage level are specifically as follows: the lower limit value of the normal operation range corresponding to the 220-volt single-phase power supply voltage is set to 90% of the nominal voltage, and the upper limit value is set to 107% of the nominal voltage; the lower limit value of the operation deviation range corresponding to the 220-volt single-phase power supply voltage is set to 80% of the nominal voltage, and the upper limit value is set to 115% of the nominal voltage; the lower limit value of the normal operation range corresponding to the 380-volt three-phase power supply voltage is set to 93% of the nominal voltage, and the upper limit value is set to 107% of the nominal voltage; the lower limit value of the operation deviation range corresponding to the 380-volt three-phase power supply voltage is set to 80% of the nominal voltage, and the upper limit value is set to 115% of the nominal voltage.

[0009] As a preferred scheme, the abnormal evaluation unit is set to the power supply range of a transformer, which is recorded as a substation; the number of abnormal users in the preset abnormal evaluation unit is counted, and if the number of abnormal users is not less than a preset piecemeal over-limit threshold, it is recorded as a piecemeal over-limit voltage abnormality. Specifically, the real-time voltage value of the user in the substation is determined to be abnormal and the over-limit users whose duration is not less than one hour are obtained, and when the number of users belonging to the same over-limit user type is counted to be not less than forty, the substation is marked as a piecemeal over-limit voltage abnormality.

[0010] As a preferred solution, (i, j) is used to represent the user's over-limit type, wherein i represents the user's over-lower limit situation, i=0 represents no over-lower limit, i=1 represents general over-lower limit, i=2 represents severe over-lower limit, and j represents the user's over-upper limit situation, j=0 represents no over-upper limit, j=1 represents general over-upper limit, and j=2 represents severe over-upper limit; based on the user's over-limit type, it is divided into piece-wise over-limit voltage abnormality types, including over-upper limit, severe over-upper limit, general over-upper limit, over-lower limit, severe over-lower limit, general over-lower limit and bidirectional over-limit.

[0011] As a preferred solution, the connection relationship based on the station-line-substation-user topological relationship model is traced back gradually from the user end, specifically: when the voltage at the user end is abnormal, first check and analyze the load rate, tap switch position and reactive power compensation of the connected transformer to determine whether it is the source of the abnormality; if the transformer is normal, check whether there is a short circuit, grounding and line break fault in the transmission line, and analyze the transmission line load and voltage drop; if the transmission line is also normal, check the substation.

[0012] In a second aspect, the present invention provides a voltage anomaly tracing system based on a station-line-substation-user topological relationship, which is used to implement the voltage anomaly tracing method as described in the first aspect.

[0013] In a third aspect, the present invention provides an electronic device, wherein the computer device includes a memory, a processor, and a computer program, and when the computer program is executed by the processor, the voltage anomaly tracing method as described in the first aspect is implemented.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the voltage anomaly tracing method as described in the first aspect.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Traditional voltage anomaly tracing methods often lack systematic and directional tracing paths, resulting in long tracing time and low accuracy. This invention achieves a systematic description of the power system structure by constructing a station-line-transformer topological relationship model, laying a solid foundation for voltage anomaly tracing. The station-line-transformer topological relationship model is used to quickly locate the source of voltage anomalies, significantly improving the accuracy and efficiency of tracing and greatly shortening the troubleshooting time.

[0017] 2. The traditional voltage anomaly determination method only relies on a fixed voltage range for determination, ignoring the normal operating range and allowable deviation range under different voltage levels, which can easily lead to misjudgment or missed judgment. The present invention refines the voltage anomaly determination criteria, fully considers the normal operating range and allowable deviation range under different voltage levels, thereby improving the accuracy and reliability of voltage anomaly determination.

[0018] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a flowchart of the voltage anomaly tracing method according to an embodiment of the present invention.

[0021] Figure 2 It is a structural diagram of an electronic device described in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of a user voltage curve according to Embodiment 5 of the present invention.

[0023] Figure 4It is a schematic diagram of the voltage value curve of the substation described in Example 5 of the present invention.

[0024] Figure 5 It is another schematic diagram of the transformer area voltage value curve described in the fifth embodiment of the present invention.

[0025] Figure 6 It is another schematic diagram of the transformer area voltage value curve described in the fifth embodiment of the present invention.

[0026] Figure Number:

[0027] 200. Electronic equipment;

[0028] 201, processor; 202, communication bus; 203, user interface; 204, network interface; 205, memory. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] In the following description, multiple embodiments of the present invention are provided, and different embodiments may be replaced or combined, so the present invention may also be considered to include all possible combinations of the same and / or different embodiments described. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then the present invention should also be considered to include embodiments containing one or more of A, B, C, and D, all other possible combinations, even though the embodiment may not be clearly described in the following text.

[0031] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements described without departing from the scope of the present invention. Various processes or components may be appropriately omitted, substituted or added to each example. For example, the described method may be performed in an order different from the described order, and various steps may be added, omitted or combined. In addition, the features described in some examples may be combined in other examples.

[0032] In order to facilitate a better understanding of the embodiments of the present invention, before explaining the specific implementation modes of the present invention in detail, its application scenarios are first described.

[0033] The voltage anomaly tracing method described in the embodiments of this specification is applied to the daily monitoring, troubleshooting and optimization and transformation processes of the power network. In these scenarios, the application of the voltage anomaly tracing method aims to gradually trace the source of the voltage anomaly from the user end upward, thereby comprehensively improving the management level and operation efficiency of the power system.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, this embodiment provides a voltage anomaly tracing method based on station-line-substation topological relationship, including the steps of: S1, obtaining station-line-substation information of the target power system to construct a station-line-substation topological relationship model to support dynamic perception of voltage fluctuations caused by loads, distributed power sources and energy storage systems in the power system, and can quickly respond to load changes and new energy output fluctuations, and achieve precise control of grid voltage through intelligent analysis and decision-making, and quickly manage voltage over-limit in a short time. The constructed station-line-substation topological relationship model includes the connection relationship between the substation and the transmission line, and the connection relationship between the transmission line and the transformer. and the connection relationship between the transformer and the user; S2, collect the real-time data of the key nodes of the target power system, and the real-time data of the key nodes includes the real-time value of the user voltage; S3, obtain the preset voltage anomaly judgment standard and determine whether the real-time value of the user voltage is abnormal based on this and mark the corresponding voltage over-limit type; S4, count the number of abnormal users in the preset abnormal evaluation unit, if the number of abnormal users is not less than the preset sheet-like over-limit threshold, it is recorded as a sheet-like over-limit voltage anomaly, and based on the connection relationship in the station-line-transformer topological relationship model, gradually trace upward from the user end to determine the source of the voltage anomaly. More specifically, obtaining the station-line-transformer information of the target power system can be achieved through geographic information system (GIS) technology. The key nodes of the target power system also include the low-voltage side of the substation bus and the transformer. This embodiment integrates the main grid bus load data, the distribution network area gateway load data, and the real-time measurement data of the low-voltage user to avoid equipment collection accuracy, false alarms, missed reports, etc., and conducts a comprehensive evaluation according to the voltage anomaly. At the same time, the evaluation reliability is improved according to the different attributes and parameters of the equipment, and the accuracy of abnormal source tracing and positioning is enhanced.

[0036] Specifically, this embodiment provides a preferred implementation method, wherein the station-line-user information of the target power system includes substation information, transmission line information, transformer information, and user information; the substation information includes the location, number, and capacity of the substation; the transmission line information includes the length, model, and direction of the transmission line; the transformer information includes the installation location, capacity, and transformation ratio of the transformer; and the user information includes the user's address and load.

[0037] Specifically, this embodiment provides a preferred implementation method. This embodiment decomposes the evaluation of the cause of voltage anomaly into multiple levels, each level focuses on different evaluation indicators, and the preset voltage anomaly judgment standard includes the normal operation range and the operation deviation range corresponding to the voltage level. This multi-level analysis strategy not only enhances the depth and breadth of the evaluation, but also promotes the weight allocation and comprehensive consideration between different indicators, making the final auxiliary decision more scientific and reasonable. Based on the preset voltage anomaly judgment standard, it is determined whether the user voltage real-time value is abnormal and the corresponding voltage over-limit type is marked as follows: if the user voltage real-time value is lower than the lower limit value of the voltage normal range and not lower than the lower limit value of the operation deviation range, it is marked as generally over-limit; if the user voltage real-time value is lower than the lower limit value of the operation deviation range, it is marked as severely over-limit; if the user voltage real-time value is higher than the upper limit value of the voltage normal range and not higher than the upper limit value of the operation deviation range, it is marked as generally over-limit; if the user voltage real-time value is higher than the upper limit value of the operation deviation range, it is marked as severely over-limit.

[0038] Specifically, this embodiment provides a preferred implementation scheme, and the normal operation range and the operation deviation range corresponding to the voltage level are as follows: the lower limit value of the normal operation range corresponding to the 220-volt single-phase power supply voltage is set to 90% of the nominal voltage, and the upper limit value is set to 107% of the nominal voltage; the lower limit value of the operating deviation range corresponding to the 220-volt single-phase power supply voltage is set to 80% of the nominal voltage, and the upper limit value is set to 115% of the nominal voltage; the lower limit value of the normal operation range corresponding to the 380-volt three-phase power supply voltage is set to 93% of the nominal voltage, and the upper limit value is set to 107% of the nominal voltage; the lower limit value of the operating deviation range corresponding to the 380-volt three-phase power supply voltage is set to 80% of the nominal voltage, and the upper limit value is set to 115% of the nominal voltage.

[0039] Specifically, this embodiment provides a preferred implementation method, wherein the abnormal evaluation unit is set to the power supply range of a transformer, recorded as a substation; the number of abnormal users in the preset abnormal evaluation unit is counted, and if the number of abnormal users is not less than the preset sheet-wise over-limit threshold, it is recorded as a sheet-wise over-limit voltage abnormality. Specifically, the real-time voltage value of the user in the substation is determined to be abnormal and the over-limit user lasting for not less than one hour is obtained, and when the number of users belonging to the same over-limit user type is counted to be not less than forty, the substation is marked as a sheet-wise over-limit voltage abnormality.

[0040] Specifically, this embodiment provides a preferred implementation, as shown in Table 1, using (i, j) to represent the user over-limit type, wherein i represents the user over-limit situation, i=0 represents no over-limit, i=1 represents general over-limit, i=2 represents severe over-limit, j represents the user over-limit situation, j=0 represents no over-limit, j=1 represents general over-limit, j=2 represents severe over-limit; based on the user over-limit type, it is divided into piece-wise over-limit voltage abnormality types, as shown in Table 2, including over-limit, severe over-limit, general over-limit, over-limit, severe over-limit, general over-limit and bidirectional over-limit.

[0041] Table 1

[0042] User limit type meaning (0，0) Neither the lower limit nor the upper limit has been exceeded (0，1) Does not exceed the lower limit, generally exceeds the upper limit (0，2) The lower limit has not been exceeded, but the upper limit has been seriously exceeded (1，0) Generally, the lower limit is exceeded but the upper limit is not exceeded (1，1) Generally, the lower the limit, the higher the upper limit. (1，2) Generally, the lower the limit, the more serious the upper limit (2，0) Severely exceeded the lower limit, but not exceeded the upper limit (2，1) The more severe the lower limit, the more generally the upper limit (2，2) The more serious the lower limit, the more serious the upper limit

[0043] Table 2

[0044] Types of abnormal voltage over-limit in a piece Calculation method Over the limit (0，1)+(1，1)+(2，1)+(0，2)+(1，2)+(2，2)>＝40 Severely exceeded the limit (0，2)+(1，2)+(2，2)>＝40 Generally over the limit Exceeding the limit of the number of stations - Severely exceeding the limit of the number of stations Crossing the lower limit (1，0)+(1，1)+(1，2)+(2，0)+(2，1)+(2，2)>＝40 Seriously exceeded the lower limit (2，0)+(2，1)+(2，2)>＝40 Generally, the lower limit Number of stations that exceed the lower limit - Number of stations that seriously exceed the lower limit Bidirectional crossing (1，1)+(1，2)+(2，1)+(2，2)＞＝40

[0045] Specifically, this embodiment provides a preferred implementation method, in which the connection relationship in the station-line-substation-user topology relationship model is traced back gradually from the user end upward, specifically: when the voltage at the user end is abnormal, first check and analyze the load rate, tap switch position and reactive compensation status of the connected transformer to determine whether it is the source of the abnormality; if the transformer is normal, check whether there is a short circuit, grounding and line break fault in the transmission line, and analyze the transmission line load and voltage drop; if the transmission line is also normal, check the substation.

[0046] Embodiment 2:

[0047] This embodiment provides a voltage anomaly tracing system based on a station-line-substation-user topology relationship, which is used to implement the voltage anomaly tracing method as described in the first embodiment.

[0048] Embodiment three:

[0049] like Figure 2 As shown, this embodiment provides an electronic device, which may include: at least one processor, at least one network interface, a user interface, a memory, and at least one communication bus.

[0050] The communication bus can be used to realize the connection and communication among the above-mentioned components.

[0051] The user interface may include buttons, and the optional user interface may also include a standard wired interface or a wireless interface.

[0052] The network interface may include but is not limited to a Bluetooth module, an NFC module, a Wi-Fi module, etc.

[0053] Among them, the processor may include one or more processing cores. The processor uses various interfaces and lines to connect the various parts of the entire electronic device, and executes various functions of the electronic device and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory, and calling data stored in the memory. Optionally, the processor can be implemented in at least one hardware form of DSP, FPGA, and PLA. The processor can integrate one or a combination of CPU, GPU, modem, etc. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing the content to be displayed on the display; the modem is used to handle wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor, but may be implemented separately through a chip.

[0054] Among them, the memory may include RAM or ROM. Optionally, the memory includes a non-transitory computer-readable medium. The memory can be used to store instructions, programs, codes, code sets or instruction sets. The memory may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store data involved in the above-mentioned various method embodiments, etc. The memory may also be at least one storage device located away from the aforementioned processor. The memory as a computer storage medium may include an operating system, a network communication module, a user interface module and a tracing application. The processor may be used to call the tracing application stored in the memory and execute the steps of the voltage anomaly tracing method mentioned in the above-mentioned embodiment.

[0055] Embodiment 4:

[0056] This embodiment provides a computer-readable storage medium, which stores instructions. When the computer-readable storage medium is executed on a computer or a processor, the computer or the processor executes the above-mentioned Figure 1 One or more steps in the illustrated embodiment. If the components of the electronic device described above are implemented in the form of software functional units and sold or used as independent products, they can be stored in the computer-readable storage medium.

[0057] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of this specification is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that contains one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0058] A person of ordinary skill in the art can understand that all or part of the processes in the method of the first embodiment can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. The aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes. In the absence of conflict, the technical features in this embodiment and the implementation scheme can be combined arbitrarily.

[0059] Embodiment five:

[0060] In order to verify the effectiveness of the voltage anomaly tracing method based on the station-line-substation-user topology relationship described in this specification, this embodiment performs voltage anomaly tracing based on the actual application scenario of the voltage anomaly tracing method. The specific process is as follows:

[0061] The geographical coordinates, actual layout and connection status of the substation (Banxi substation), busbar (10kVⅠ section busbar), transmission line (Gezhu D899 line), substation (Xikou Hutan public substation) and user are obtained, and a station-line-substation-user topological relationship model is constructed. The station-line-substation-user topological relationship model clarifies the connection relationship between the substation and the transmission line, the starting and ending points of the transmission line and the connection relationship with the transformer, the position of the transformer in the transmission line and the connection relationship with the user end.

[0062] Based on the set voltage anomaly judgment standard, there are a total of 231 users in the substation (Xikou Hutan public substation), of which 227 are in the general voltage over-limit (voltage is higher than (not included) 107% and lower than 115%), and 4 are not over-limited. Over-limit users account for 98.27% of the total number of users in the substation, and there is a phenomenon of users over-limiting in groups. The distribution of the number of over-limit users is shown in Table 3.

[0063] Table 3

[0064] Limit type Not exceeding the upper limit Generally over the limit Severely exceeded the limit Not exceeding the lower limit 4 227 0 Generally, the lower limit 0 0 0 Seriously exceeded the lower limit 0 0 0

[0065] Taking the user end with abnormal voltage as the starting point, the user daily collected voltage is aggregated and analyzed, such as Figure 3 As shown, it can be found that the average voltage of users in this substation exceeds 240V throughout the day, exceeding the standard voltage upper limit of 235.4V, and the minimum voltage is above 225V, which has a large adjustable space from the standard voltage lower limit of 198V. Combined with the user voltage evaluation algorithm, it is concluded that the user side voltage is abnormal, and the over-limit range accounts for 98.27% of the total number of users. There is a phenomenon of over-limit in large areas, and it is recommended to unify the upstream power supply regulation.

[0066] Check the transformer (Xikou Hutan public transformer) and conduct correlation analysis on the daily voltage collected by the distribution transformer. Figure 4 As shown, it can be found that the voltage of the distribution transformer in the substation on that day was in the normal voltage fluctuation range of 242V to 252V (198Vμ253V), and there was no over-limit situation. The substation voltage was normal, but the overall voltage was high, and there was a risk of exceeding the upper limit. In addition, there were cases of affiliated users exceeding the upper limit in groups. Combined with the substation voltage evaluation algorithm, it was concluded that the voltage on the substation side was normal, there was a risk of exceeding the upper limit, and downstream users exceeded the limit in groups, so there was a need for adjustment. The voltage value exceeded 242V throughout the day, and it was feasible to reduce it.

[0067] Based on the horizontal investigation of the transmission line (Gezhu D899 line) and the related substation (Xikou Nijia No. 2 public transformer), the daily voltage collection of the distribution transformer was analyzed. Figure 5As shown in the figure, it can be found that the voltage of the distribution transformer in the substation on that day was in the normal voltage fluctuation range of 228V to 236V (198Vμ253V), and there was no over-limit situation, and the substation voltage was normal. Combined with the bus voltage evaluation algorithm, it was concluded that the voltage on the main grid side was normal, and the voltage fluctuation range was generally lower than the qualified range, with no room for downward adjustment.

[0068] Further check the substation, analyze the bus voltage of the substation, and conduct correlation analysis on the daily collected bus voltage. Figure 6 As shown, it can be found that the bus voltage of the substation on that day was in the normal voltage fluctuation range of 10025V to 10387V (10000V~10700V), and there was no over-limit situation. The bus voltage was normal and the adjustable space was small.

[0069] Combined with the above analysis, the system automatically generates auxiliary decisions, the voltage over-limit abnormal object is the user, the adjustment object is the substation, and the adjustment strategy is to remove the capacitor or downgrade the substation.

[0070] Through the example analysis, it can be seen that when the voltage exceeds the limit, the abnormal object and the adjustment object can be quickly located through the station-line-transformer source tracing analysis and auxiliary decision-making control method, and the voltage of all nodes within its range is kept within a safe range through intelligent auxiliary decision-making. This embodiment verifies the effectiveness of the voltage anomaly tracing method based on the station-line-transformer topological relationship of this specification.

[0071] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0072] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0073] The above is only an exemplary embodiment of the present invention and cannot be used to limit the scope of the present invention. That is, any equivalent changes and modifications made according to the teachings of the present invention are still within the scope of the present invention. After considering the specification and practicing the disclosure here, it will be easy for those skilled in the art to think of the implementation scheme of the present invention. The present invention is intended to cover any modification, use or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not recorded in the present invention. The description and examples are only regarded as exemplary, and the scope and spirit of the present invention are defined by the claims.

Claims

1. A voltage anomaly tracing method based on station-line-substation-user topological relationship, characterized in that: Includes steps: S1. Obtain the station-line-user information of the target power system to construct a station-line-user topological relationship model, wherein the station-line-user topological relationship model includes the connection relationship between the substation and the transmission line, the connection relationship between the transmission line and the transformer, and the connection relationship between the transformer and the user; S2. Collecting real-time data of key nodes of the target power system, wherein the real-time data of key nodes includes real-time values ​​of user voltage; S3, obtaining a preset voltage abnormality judgment standard and based on it, determining whether the user voltage real-time value is abnormal and marking the corresponding voltage over-limit type; S4. Count the number of abnormal users in the preset abnormal evaluation unit. If the number of abnormal users is not less than the preset sheet-wise over-limit threshold, it is recorded as a sheet-wise over-limit voltage abnormality. Based on the connection relationship in the station-line-substation topology relationship model, the connection is traced upward from the user end to determine the source of the voltage abnormality.

2. A voltage anomaly tracing method based on station-line-substation-user topology relationship according to claim 1, characterized in that: The station-line-user information of the target power system includes substation information, transmission line information, transformer information, and user information; The substation information includes the location, number and capacity of the substation; The transmission line information includes the length, model and direction of the transmission line; The transformer information includes the installation location, capacity and transformation ratio of the transformer; The user information includes the user's address and load.

3. A voltage anomaly tracing method based on station-line-substation-user topology relationship according to claim 2, characterized in that: The preset voltage abnormality judgment standard includes a normal operation range and an operation deviation range corresponding to the voltage level; The specific method of determining whether the user voltage real-time value is abnormal and marking the corresponding voltage over-limit type based on the preset voltage abnormality determination standard is as follows: If the user voltage real-time value is lower than the lower limit of the normal voltage range and not lower than the lower limit of the operation deviation range, it is marked as generally crossing the lower limit; If the real-time value of the user voltage is lower than the lower limit of the operation deviation range, it is marked as severely exceeding the lower limit; if the real-time value of the user voltage is higher than the upper limit of the normal voltage range and not higher than the upper limit of the operation deviation range, it is marked as generally exceeding the upper limit; If the real-time value of the user voltage is higher than the upper limit value of the operation deviation range, it is marked as seriously exceeding the upper limit.

4. A voltage anomaly tracing method based on station-line-substation-user topology relationship according to claim 3, characterized in that: The normal operation range and the operation deviation range corresponding to the voltage level are specifically as follows: the lower limit of the normal operation range corresponding to the 220V single-phase power supply voltage is set to 90% of the nominal voltage, and the upper limit is set to 107% of the nominal voltage; The lower limit of the operating deviation range corresponding to the 220V single-phase power supply voltage is set to 80% of the nominal voltage, and the upper limit is set to 115% of the nominal voltage; The lower limit of the normal operating range corresponding to the 380V three-phase power supply voltage is set to 93% of the nominal voltage, and the upper limit is set to 107% of the nominal voltage; The lower limit value of the operating deviation range corresponding to the 380V three-phase power supply voltage is set to 80% of the nominal voltage, and the upper limit value is set to 115% of the nominal voltage.

5. A voltage anomaly tracing method based on station-line-substation-user topology relationship according to claim 4, characterized in that: The abnormality evaluation unit is set to the power supply range of a transformer, which is recorded as a transformer area; The number of abnormal users in the preset abnormal evaluation unit is counted, and if the number of abnormal users is not less than the preset slice-wise over-limit threshold, it is recorded as a slice-wise over-limit voltage abnormality. Specifically, it is: Obtain the users in the substation whose real-time voltage values ​​are judged to be abnormal and whose duration is not less than one hour, and mark the substation as a clustered voltage abnormality when the number of users belonging to the same type of users is not less than 40.

6. A voltage anomaly tracing method based on station-line-substation-user topology relationship according to claim 5, characterized in that: (i, j) is used to represent the type of user crossing the limit, where i represents the situation where the user crosses the lower limit, i=0 represents not crossing the lower limit, i=1 represents generally crossing the lower limit, i=2 represents severely crossing the lower limit, and j represents the situation where the user crosses the upper limit, j=0 represents not crossing the upper limit, j=1 represents generally crossing the upper limit, and j=2 represents severely crossing the upper limit; Based on the user's over-limit type, it is divided into piecemeal over-limit voltage abnormality types, including over-limit, severe over-limit, general over-limit, over-limit, severe over-limit, general over-limit and bidirectional over-limit.

7. The voltage anomaly tracing method based on the station-line-substation-user topology relationship as described in claim 6 is characterized in that: The connection relationship in the station-line-user topology relationship model is traced back gradually from the user end upwards, specifically: When the voltage at the user end is abnormal, first check and analyze the load rate, tap position and reactive power compensation of the connected transformer to determine whether it is the source of the abnormality; If there is no abnormality in the transformer, check whether there are short circuit, grounding and disconnection faults in the transmission line, and analyze the load and voltage drop of the transmission line; If there is no abnormality in the transmission line, check the substation.

8. A voltage anomaly tracing system based on station-line-substation-user topological relationship, characterized in that: Used to implement the voltage anomaly tracing method as described in any one of claims 1 to 7.

9. A computer device, comprising a memory, a processor and a computer program, characterized in that: When the computer program is executed by a processor, the voltage anomaly tracing method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the voltage anomaly tracing method according to any one of claims 1 to 7 is implemented.

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